Keystones — Capstone
Five GCSE retrieval questions · 3 September 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √325
Answer: 5√13 -
2. Algebra Completing the square
Complete the square: x² - 3x + 8
Answer: (x - 3⁄2)² + 23⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 12cm, angle = 43°. Give your answer to 2 decimal places
Answer: 122.76cm² -
4. Ratio Combining two ratios
a:b is 8:9 and b:c is 8:5. Find a:b:c in its simplest form.
Answer: 64:72:45 -
5. Statistics Averages and range
Find the mean, median and range of: 25, 13, 47, 40, 53, 31, 81. Give your answer to 2 decimal places
Answer: Mean = 41.43, Median = 40, Range = 68